linux-kernel - Re: [PATCH] [ARM] Unconditional call to smp_cross

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Message-ID: <20120523191750.GA7608@n2100.arm.linux.org.uk>
Date:	Wed, 23 May 2012 20:17:50 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	linux-kernel@...r.kernel.org, Russ.Dill@...com, mporter@...com
Subject: Re: [PATCH] [ARM] Unconditional call to smp_cross_call on UP
	crashes

On Wed, May 23, 2012 at 07:52:48PM +0100, Russell King - ARM Linux wrote:
> On Thu, May 24, 2012 at 05:09:59PM +0000, Pantelis Antoniou wrote:
> > omap2plus_defconfig builds with SMP & SMP_ON_UP set.
> > On beagle (which is UP) is_smp() returns false and we don't call
> > smp_init_cpus which in turn does not initialize smp_cross_call which
> > remains NULL.
> > 
> > When issuing a reboot we OOPS with a NULL dereference on stop smp_call.
> > 
> > Fixed by checking is_smp in smp_send_stop()
> 
> 1. No sign-off, so this patch _can't_ be committed.
> 
> 2. Poor description.  You say it oopses, but you don't include the oops.
> So, when I read this I've no idea exactly why this is failing.  And it
> _shouldn't_ fail, so I want to know what you are seeing.

And 3. not sent to linux-arm-kernel (please copy with patches so everyone
in the ARM community is aware of them, thanks.)
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